John Calvin's Bible Commentary
Psalms 119:58
58.I have earnestly besought thy face. In this verse David asserts, that he still persevered in the exercise of prayer; for without prayer faith would become languid and lifeless. The manner in which he expresses himself, which, in other languages, might be unpolished, among the Hebrews, expresses that familiar communication to which God admits, and even invites his servants when they come into his presence. The substance of his prayers, and the sum of his desires, he comprehends in a single sentence; namely, that he implored the mercy of God, the sure hope of which he had formed from his word. Let us observe, then, in the first place, we are aroused from our supineness, that we may exercise our faith by prayer. In the second place, the principal thing for which we ought to pray is, that God, out of his free grace, may be favorable to us, look on our affection, and grant us relief. God does, indeed, aid us in a variety of ways, and our necessities also are innumerable; still the thing which we must principally and particularly request is, that he: will have mercy upon us, which is the source of every other blessing. And, in the last place, that we may not present prayers that have no meaning, let us learn that God, in all his promises, is set before us as if he were our willing debtor.